Measurement of Extreme Hyperfine Fields in Two-Coordinate High-Spin Fe2+Complexes by Mössbauer Spectroscopy: Essentially Free-Ion Magnetism in the Solid State

2014 ◽  
Vol 53 (22) ◽  
pp. 12100-12107 ◽  
Author(s):  
Aimee M. Bryan ◽  
Chun-Yi Lin ◽  
Michio Sorai ◽  
Yuji Miyazaki ◽  
Helen M. Hoyt ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Solid State ◽  
High Spin ◽  
Mossbauer Spectroscopy ◽  
Hyperfine Fields ◽  
Mößbauer Spectroscopy ◽  
Free Ion

Mössbauer spectroscopy of 119mSn employing a solid state detector

1972 ◽  
Vol 98 (1) ◽  
pp. 41-44 ◽  
Author(s):  
A. Biran ◽  
A. Yarom ◽  
P.A. Montano ◽  
H. Shechter ◽  
U. Shimony
Keyword(s):  
Mössbauer Spectroscopy ◽  
Solid State ◽  
Mossbauer Spectroscopy ◽  
Solid State Detector ◽  
Mößbauer Spectroscopy ◽  
State Detector

Mössbauer spectra of α- and γ-polymorphs of FeOOH and Fe2O3 : effects of poor crystallinity and of Al-for-Fe substitution

Clay Minerals ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 591-606 ◽  
Author(s):  
E. De Grave ◽  
C. A. Barrero ◽  
G. M. Da Costa ◽  
R. E. Vandenberghe ◽  
E. Van San
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mössbauer Spectra ◽  
Mossbauer Spectroscopy ◽  
Precise Determination ◽  
Zero Field ◽  
Hyperfine Fields ◽  
Morin Transition ◽  
Mossbauer Spectra ◽  
Al Content ◽  
Mößbauer Spectroscopy

AbstractThis paper presents various aspects, revealed by Mössbauer spectroscopy, of structural and magnetic properties of Al-substituted small-particle soil-related oxides. For goethite we focus on the relations between the hyperfine fields on the one hand, and crystallinity and Al content on the other. It is argued that these relations only provide a rough estimate of the Al content in natural samples. The ferrimagnetic-like behaviour reflected in the external-field Mössbauer spectra (4.2 K, 60 kOe) of certain Al goethites is presented. The spectra obtained for lepidocrocites are not spectacular, but confirmed that up to ∼10 at.% Al can be incorporated in the structure. Three differently-made series of hematites are considered. The Morin transition and spin structures in hematite are very sensitive to crystallinity and Al content, and probably to the presence of structural OH–. Integral low-energy electron Mössbauer spectroscopy on non-substituted samples indicates that the Morin-transition temperature in the surface layers (2 to 5 nm) is not significantly shifted from the bulk value. Measurements in extremely high magnetic fields (140 kOe) have shown that a spin-flip transition is induced in highly-substituted samples which exhibit no Morin transition in zero field. The use of external fields is crucial for the characterization and precise determination of the hyperfine parameters and site occupancies for maghemites, and for phase analyses of magnetic soils.

Fe Doping Effects in Aerosol Processed YBa2 (Cu1-xFex)307–δ Submicrocrystalline Grains

1989 ◽  
Vol 169 ◽  
Author(s):  
P. Boolchand ◽  
P. Biswas ◽  
D. Zhou ◽  
D. McDaniel ◽  
W. Huff ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Solid State ◽  
Mossbauer Spectroscopy ◽  
Dopant Concentration ◽  
Fe Doping ◽  
Mößbauer Spectroscopy ◽  
Doping Effects ◽  
Host Structure

AbstractMagnetization and Mössbauer spectroscopy results on aerosol processed YBa2 (Cu1-xFex)307–δ samples are presented. Systematics of Tc(x), x(x) and Fe dopant site occupancies In/I(x) as a function of dopant concentration ‘x’ are deduced and compared to those established on analogous solid-state- reacted samples. The absence of twinning in the aerosol processed grains leads to a random replacement of Cu for Fe in chains and planes of the host structure.

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